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Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 10, 2024 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2025 USD ($) Reinsurer | Dec. 31, 2024 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Ceded rate of premiums under insurance program |  |  | 100.00% |
Ceded unpaid loss |  |  | $ 445 |
Prepaid reinsurance premiums |  |  | 480 | $ 520
Increase (decrease) in loss and loss adjustment expense reserve |  |  | $ 0 |
Number of reinsurers | Reinsurer |  |  | 2 |
Premium net written |  |  | $ 24 |
Net earned premiums |  |  | 19 |
Ultimate loss reserve expense inclusive of IBNR claims |  |  | $ 462 | 1,543
Wright National Flood Insurance Company |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Ceded rate of premiums under insurance program |  |  | 100.00% |
Prepaid reinsurance premiums |  |  | $ 480 |
Reserve for losses and loss adjustment expense |  |  | $ 445 |
Expenses and allowance rate received in premiums |  |  | 29.10% |
Premiums written net |  |  | $ 210 |
Ceded to highly rated carriers for excess flood policies |  |  | 1 |
Statutory capital and surplus required |  |  | 8 |
Statutory capital and surplus |  |  | 46 | 44
Statutory net Income |  |  | $ 1 | $ 9
Percentage of adjusted net income |  |  | 100.00% |
Maximum dividend payout that may be made without prior approval |  |  | $ 9 |
Dividend paid | $ 7 |  |  |
Wright National Flood Insurance Company | Maximum |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Preferred stock, dividend rate, percentage |  |  | 10.00% |
Wright National Flood Insurance Company | FEMA |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Premiums written net |  |  | $ 209 |
Quota Share Captive |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Deferred acquisitions costs |  |  | 60 |
Reinsurance payable |  |  | 2 |
Reserve for losses and loss adjustment expense |  |  | 14 |
Premiums written net |  |  | 17 |
Premium net written |  |  | 23 |
Net earned premiums |  |  | 18 |
Initial funding |  | $ 6 |  |
Addition to earnings |  |  | 25 |
Ultimate loss reserve expense inclusive of IBNR claims |  |  | 22 |
Captive Insurance Facility |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Maximum aggregate annual underwriting exposure |  |  | 2 |
Captive Insurance Facility | Hurricane Ian |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Reserve for losses and loss adjustment expense |  |  | $ 4 |

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